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When connected to the photo voltaic panel, the fan can run; and may be used alone via plugging into the computer's USB port. When linked to a photograph voltaic panel, the manner the fan works will depend on the sunlight. When the solar is irradiated to generate hot air, the fan straight rotates to use up warm temperature in time, ventilate, save the trouble of pulling wires, and it is safer and additional convenient. There is no rechargeable battery within the fan; if you want the fan to paintings at night, you should use the power pack. Specification: Solar panel chip: Polysilicon Solar panel power: 5W, 6V Panel size: 14/5 Mini fan: Size: four inches Power supply: USB plug, 5V USB cable length: 70cm/27 Material: Metal colour: black Package Contents: 1 x Solar Panel 1 x Fan Only the above equipment content, various merchandise shouldn't included. Note: Light capturing and varied reveals can cause the colour of the item in the photo a little bit assorted from the genuine thing. The measurement allowed error is +/- 1-3cm.